TY - JOUR
T1 - Two-coordinate magnesium(I) dimers stabilized by super bulky amido ligands
AU - Boutland, Aaron J.
AU - Dange, Deepak
AU - Kefalidis, Christos E.
AU - Stasch, Andreas
AU - Maron, Laurent
AU - Jones, Cameron
N1 - The authors thank the Australian Research Council (C.J.), The U.S. Air Force Asian Office of Aerospace Research and Development (grant FA2386-14-1-4043 (C.J.)), and the Alexander von Humboldt Foundation for an experienced researcher grant (L.M.).
PY - 2016/8/1
Y1 - 2016/8/1
N2 - A variety of very bulky amido magnesium iodide complexes, LMgI(solvent)0/1 and [LMg(μ-I)(solvent)0/1]2 (L=-N(Ar)(SiR3); Ar=C6H2{C(H)Ph2}2R′-2,6,4; R=Me, Pri, Ph, or OBut; R′=Pri or Me) have been prepared by three synthetic routes. Structurally characterized examples of these materials include the first unsolvated amido magnesium halide complexes, such as [LMg(μ-I)]2 (R=Me, R′=Pri). Reductions of several such complexes with KC8 in the absence of coordinating solvents have afforded the first two-coordinate magnesium(I) dimers, LMg−MgL (R=Me, Pri or Ph; R′=Pri, or Me), in low to good yields. Reductions of two of the precursor complexes in the presence of THF have given the related THF adduct complexes, L(THF)Mg−Mg(THF)L (R=Me; R′=Pri) and LMg−Mg(THF)L (R=Pri; R′=Me) in trace yields. The X-ray crystal structures of all magnesium(I) complexes were obtained. DFT calculations on the unsolvated examples reveal their Mg−Mg bonds to be covalent and of high s-character, while Ph⋅⋅⋅Mg bonding interactions in the compounds were found to be weak at best.
AB - A variety of very bulky amido magnesium iodide complexes, LMgI(solvent)0/1 and [LMg(μ-I)(solvent)0/1]2 (L=-N(Ar)(SiR3); Ar=C6H2{C(H)Ph2}2R′-2,6,4; R=Me, Pri, Ph, or OBut; R′=Pri or Me) have been prepared by three synthetic routes. Structurally characterized examples of these materials include the first unsolvated amido magnesium halide complexes, such as [LMg(μ-I)]2 (R=Me, R′=Pri). Reductions of several such complexes with KC8 in the absence of coordinating solvents have afforded the first two-coordinate magnesium(I) dimers, LMg−MgL (R=Me, Pri or Ph; R′=Pri, or Me), in low to good yields. Reductions of two of the precursor complexes in the presence of THF have given the related THF adduct complexes, L(THF)Mg−Mg(THF)L (R=Me; R′=Pri) and LMg−Mg(THF)L (R=Pri; R′=Me) in trace yields. The X-ray crystal structures of all magnesium(I) complexes were obtained. DFT calculations on the unsolvated examples reveal their Mg−Mg bonds to be covalent and of high s-character, while Ph⋅⋅⋅Mg bonding interactions in the compounds were found to be weak at best.
KW - Bulky amides
KW - DFT calculations
KW - Magnesium(I)
KW - Metal–metal bonding
U2 - 10.1002/anie.201604362
DO - 10.1002/anie.201604362
M3 - Article
SN - 1521-3773
VL - 55
SP - 9239
EP - 9243
JO - Angewandte Chemie International Edition
JF - Angewandte Chemie International Edition
IS - 32
ER -